Antec Offers USB 3.0 to USB 2.0 Connector

Antec has announced that users that have purchased a P280 or Eleven Hundred series case that don't have a need for USB 3.0 are in luck. Antec will provide an internal USB 3.0 to USB 2.0 connector free of charge to those that find themselves with a motherboard that doesn't support the latest generation of USB. This will allow those users to take advantage of the two USB 3.0 ports found on the case itself. The connector can be obtained by contacting Antec support through the website or by calling 1-800-22ANTEC in the US. Users need only to provide proof of purchase for either case to receive the connector.

USB 3.0 IS backwards compatible. However, I'm guessing that only holds true for devices. In other words, the issue here is that if you don't have a motherboard that supports USB 3.0, you cannot "power" the USB 3.0 ports on the case to even make them usable.